/**
    * This file is part of Waarp Project.
    * 
    * Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
    * COPYRIGHT.txt in the distribution for a full listing of individual contributors.
    * 
    * All Waarp Project is free software: you can redistribute it and/or modify it under the terms of
    * the GNU General Public License as published by the Free Software Foundation, either version 3 of
    * the License, or (at your option) any later version.
   * 
   * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
   * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
   * Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License along with Waarp . If not, see
   * <http://www.gnu.org/licenses/>.
   */
  package org.waarp.ftp.core.control;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.DelimiterBasedFrameDecoder;
  import io.netty.util.concurrent.EventExecutorGroup;
  
  import org.waarp.common.command.ReplyCode;
  import org.waarp.common.utility.WaarpStringUtils;
  import org.waarp.ftp.core.config.FtpConfiguration;
  import org.waarp.ftp.core.session.FtpSession;
  
  /**
   * Pipeline factory for Control command connection
   * 
   * @author Frederic Bregier
   * 
   */
  public class FtpInitializer extends ChannelInitializer<SocketChannel> {
      /**
       * CRLF, CRNUL, LF delimiters
       */
      protected static final ByteBuf[] delimiter = new ByteBuf[] {
              Unpooled.wrappedBuffer(ReplyCode.CRLF.getBytes(WaarpStringUtils.UTF8)),
              Unpooled.wrappedBuffer(ReplyCode.CRNUL.getBytes(WaarpStringUtils.UTF8)),
              Unpooled.wrappedBuffer(ReplyCode.LF.getBytes(WaarpStringUtils.UTF8)) };
  
      protected static final FtpControlStringDecoder ftpControlStringDecoder = new FtpControlStringDecoder(
              WaarpStringUtils.UTF8);
  
      protected static final FtpControlStringEncoder ftpControlStringEncoder = new FtpControlStringEncoder(
              WaarpStringUtils.UTF8);
  
      /**
       * Business Handler Class if any (Target Mode only)
       */
      protected final Class<? extends BusinessHandler> businessHandler;
  
      /**
       * Configuration
       */
      protected final FtpConfiguration configuration;
  
      /**
       * Constructor which Initializes some data for Server only
       * 
       * @param businessHandler
       * @param configuration
       */
      public FtpInitializer(Class<? extends BusinessHandler> businessHandler,
              FtpConfiguration configuration) {
          this.businessHandler = businessHandler;
          this.configuration = configuration;
      }
  
      /**
       * Create the pipeline with Handler, ObjectDecoder, ObjectEncoder.
       */
      @Override
      public void initChannel(SocketChannel ch) throws Exception {
          ChannelPipeline pipeline = ch.pipeline();
          // Add the text line codec combination first,
          pipeline.addLast("framer", new DelimiterBasedFrameDecoder(8192, delimiter));
          pipeline.addLast("decoder", ftpControlStringDecoder);
          pipeline.addLast("encoder", ftpControlStringEncoder);
          // Threaded execution for business logic
          EventExecutorGroup executorGroup = configuration.getFtpInternalConfiguration().getExecutor();
          // and then business logic. New one on every connection
          BusinessHandler newbusiness = businessHandler.newInstance();
          NetworkHandler newNetworkHandler = new NetworkHandler(new FtpSession(configuration, newbusiness));
          pipeline.addLast(executorGroup, "handler", newNetworkHandler);
      }
  }